It's pretty pointless, really. Paladins only really need two stats in this edition, STR (or DEX) and CHA. It's not like in 4e where you were forced into a choice because you also arbitrarily needed WIS.
True, and with bounded accuracy, you don't need an them that high either, if you want some feats an 18 in strength or Dex and 16 in charisma is fine by the end of the game (especially since by that time you have various ways of enhancing accruracy).
Still the only way to get a 20 in Strenth and Charisma for none humans and Dragonborn is have only one feat max and it has to be feat that grants plus 1 in either strength or Charisma (not including rolling for stats)
An example a Half Orc can start with 17 strength, 14 Charisma and he can look forward to a max of 5 feats, +2 strength, then say Tavern Brawler/+1 Strength, then +2 Charisma, +2 Charisma, and finally +2 Charisma.
A Tiefling can start out with 15 Strength and 16 Charisma, then go Tavern Brawler/+1 Strength, +2 Strength, +2 Strength, Charisma +2, +2 Charisma.
Dragonborn can go 17 Strength and 15 Charisma, Tavern Brawler/+1Strength, Actor/+1 Charisma, +2 Strength, +2 Charisma, +2 Charisma to get to 20 strength and 20 Charisma.
Still I like feats, so I might go say for a Tiefling 16 Charisma and 15 Strength and go Mounted Combatant, not just to protect my mount, but to gain advantage against enemies while mounted which will boost my accuracy as well. Then go Heavy Armour Mastery to get my strength to 16, then Probably Ritual Caster. Then +2 Strength and Finally +2 Charisma, which nets me 18 Strength and 18 Charisma and 3 feats. 14 Constutition, 13 Intelligence, 8 Dex, and 10 Wis.
Okay this kind of went on a tangent, sorry.